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Sodium permanganate, decomposition

Decomposition was initiated by the addition of a concentrated aqueous solution of calcium and sodium permanganate to the hydrogen peroxide. The use of potassium permanganate proved ineffective since KMn04 is insufficiently soluble in water and the solution contains inadequate MnO -ions for rapid initiation of the reaction. [Pg.302]

The kinetics of the reaction are relatively slow and permanganate solutions exhibit greatest stabiUty around a neutral pH. The decomposition rates increase below pH 3 or above pH 10. Potassium permanganate solutions are stable at elevated temperatures, up to approximately 3 N sodium hydroxide, above which decomposition into manganate occurs. [Pg.516]

Some of the investigations carried out in the first half of the twentieth century were related to CL associated with thermal decomposition of aromatic cyclic peroxides [75, 76] and the extremely low-level ultraviolet emission produced in different reaction systems such as neutralization and redox reactions involving oxidants (permanganate, halogens, and chromic acid in combination with oxalates, glucose, or bisulfite) [77], In this period some papers appeared in which the bright luminescence emitted when alkali metals were exposed to oxygen was reported. The phenomenon was described for derivatives of zinc [78], boron [79], and sodium, potassium, and aluminum [80]. [Pg.16]

Dithionic acid solutions are remarkably resistant to oxidation the cold solutions withstand the attack of hypochlorite, hypobromite and permanganic acid, although on boiling, these reagents become reduced by the sulphur dioxide liberated in the decomposition of the dithionic acid sodium peroxide effects a partial oxidation in the cold.2... [Pg.209]

Phenyl -tolyl selenide in aqueous suspension is boiled with potassium permanganate for several hours. The manganese mud is dissolved and the 4-carboxydiphenyl selenoxide precipitated by passing in sulphur dioxide. After filtration the precipitate is macerated with dilute sodium carbonate solution, the products of oxidation being separated in this manner into phenyl p-tolyl selenoxide and 4-carboxydiphenyl selenoxide. Addition of dilute sulphuric acid to the sodium carbonate extract causes the separation of 4-carboxydiphenyl selenoxide, which is crystallised from alcohol. The product is a microcrystalline powder, melting with decomposition at 253° to 255° C. Attempts to resolve it into optically active forms have failed the l-menthylamine salt melts at 220° to 222° C. with decomposition, and the d-a-phenyl-ethylamine salt forms feathery needles, M.pt. 194° to 195° C. with decomposition.3... [Pg.33]

When m-acetamidophenylseleninic acid is oxidised by alkaline permanganate it yields m-acetamidophenylselenonic acid, isolated in the form of the tetrahydrated barium salt, which crystallises in colourless needles, double decomposition giving the sodium salt. The latter separates from water in colourless needles and from alcohol in prismatic needles. Treatment of the barium salt with sulphuric acid releases the free acid as a dihydrate, which melts and decomposes at 229° C, (corr.). The sodium salt separates from water in plates. [Pg.50]

Unfortunately, potassium permanganate is not obtainable in high enough purity and can undergo decomposition by exposure to sunlight. Therefore it cannot be used as a primary standard (p. 143). However, it can be used in redox titrations provided it is standardized with sodium oxalate (which is available in high purity). The redox reaction involving oxalate is as follows ... [Pg.155]


See other pages where Sodium permanganate, decomposition is mentioned: [Pg.338]    [Pg.338]    [Pg.447]    [Pg.649]    [Pg.340]    [Pg.211]    [Pg.1636]    [Pg.129]    [Pg.111]    [Pg.397]    [Pg.385]    [Pg.347]    [Pg.736]    [Pg.38]    [Pg.107]    [Pg.213]    [Pg.216]    [Pg.470]    [Pg.681]    [Pg.683]    [Pg.687]    [Pg.689]    [Pg.694]    [Pg.1705]    [Pg.183]    [Pg.1636]    [Pg.179]    [Pg.35]    [Pg.66]    [Pg.872]    [Pg.421]    [Pg.217]    [Pg.31]    [Pg.47]    [Pg.357]    [Pg.7]    [Pg.72]    [Pg.535]    [Pg.626]    [Pg.631]    [Pg.738]    [Pg.756]   


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